High stability is the important of a Quartz Crystal in Crystal Oscillators

One of the most important features of an oscillator is its Frequency Stability, or in other words its ability to provide a constant frequency output under varying conditions. Some of the factors that affect the frequency stability of an oscillator include: temperature, variations in the load and changes in the power supply. Frequency stability of the output signal can be improved by the proper selection of the components used for the resonant feedback circuit including the amplifier but there is a limit to the stability that can be obtained from normal LC and RC tank circuits. For very high stability a quartz crystal is generally used as the frequency determining device to produce another types of oscillator circuit known generally as Crystal Oscillators.

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